Starr Damper
Vibration Dampers: the answer to vibration problems
Rohr Dampers
- Excellent for frequencies of 18-290 Hz
- Easily clamps on piping up to 8″
- No connection to ground
Starr Dampers
- Larger systems with vibration up to ~60Hz
- Well suited to piping from 2” to 24”
- Connect to rigid structure or the ground
- Zero static stiffness
Starr Damper Details
Starr Dampers are viscous dashpot type damping devices that act in the axial direction for the device. They are normally mounted in pairs since that produces a “plane” of vibration control. If necessary to control vibration in 3 directions, simply add another damper.
These devices provide damping over a broad frequency range of zero (low frequency sway) up to about 60 Hz. Two of the “D” size devices have been shown to control 3-5 Hz vibration on lines up to 24” and 200’ long!!
Most commonly identified with mechanical system, the damping level is described as a percentage of critical damping using the symbol ζ (Zeta), where a level of ζ = 50% critical damping will produce no amplification at the resonant frequency and result in the resonance not being observed.
Vibration Problems That Starr Dampers work Very Well On
- 2 phase flow issues (slug flow)
- General flow turbulence or cavitation
- Transient fluid loads (surging compressors, startup transients)
- Transmitted vibration from adjacent machinery
- Eliminate resonances.
Reduce vibration at natural frequencies and can produce 25% modal damping - 4 sizes available.
Provide damping for larger piping systems - Zero static stiffness.
Adapts to thermal growth with built in travel so no static stresses result - Corrosion resistant.
304 Stainless Steel standard
Dampens frequencies up to about 60 Hz Incredibly effective below 20 Hz Mounts to pipes with custom pipe clamps Mounts to structure/floor using galvanized plates Often installed in pairs to control vibration in that plane
Starr Damper Selection
| Product Model | Travel Range | Damping Leve, Lb-sec/in(at 10Hz) | Approximate Pipe Size* |
|---|---|---|---|
| A | +/- ½” | 44 | 2" |
| B | +/- ½” | 100 | 3-6" |
| C | +/- ¾” | 225 | 4-12" |
| D | +/- 1” | 506 | >8" |
- Damping levels reported above are at 10Hz.
- Static stiffness is zero.
- Not well suited for higher frequency (>100 Hz) applications.
Termination Options
- Connect to piping using custom pipe clamps
- 304 stainless steel hardware up to 6” pipe
- Galvanized clamps and attachment hardware > 6” pipe
- Mounting plates are typically galvanized for corrosion resistance
- Anchored to the ground, a column, or other “rigid” tie point
- Custom termination plates are available upon request
- Mounting hardware allows about 3° angular misalignment during assembly